I have a Black Death 4500 with the mikuni carb. Motor runs great once its warm, but acts very cold natured. On a cold start with the ckoke pulled, I have to squeeze the throttle every few seconds to keep the motor running or it will die. Almost like its not getting enough fuel but fuel pump works just fine at wide open throttle and warm idle. Any input on why it is dying out on cold start? Thanks

Possible dirty choke circuit, leaking valves, intake gasket leak...

Also possible partial plugged pilot jet

I checked the valves and they are good and the intake gaskets are brand new as well. Ive had the carb apart and cleaned it but not sure about the pilot jet.